You get no results when searching with an hyphen + with * in query string (or with preference QueryAutoTruncate) :
ie /cgi-bin/koha/opac-search.pl?q=saints-anges*

Looks like query-string by default does not compute wildcards, see analyze_wildcard in :
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html

Test plan :
1) Use Elasticsearch
2) Create a record with "saints-anges"
3) Search for "saints-anges" => you get results
4) Search for "saints-anges*" => you get results
5) Search for "saints-ang*" => you get results